my Ford Explorer AC is blowing warm air what could be wrong

Ford Explorer Fifth Generation (2011-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

4 min read

626 words

Problem Statement

Complete guide to fixing AC that blows warm air in Ford Explorer. Includes symptoms, diagnostic steps, tools required, and repair procedures.

Affected Component

HVAC

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical systems.
•Allow the engine to cool before opening the AC system to avoid burns.

Symptoms

•Warm air blowing from the AC vents
•AC compressor not engaging
•Strange noises from the AC system
•Unpleasant odors from the vents
•Reduced airflow from the AC vents
•AC system cycles on and off frequently

Diagnostic Steps

1
Inspect the AC system for visible leaks or damage to components.
2
Check the refrigerant level using a manifold gauge set.
3
Test the AC compressor operation by observing if it engages when the AC is turned on.
4
Examine the AC fuse and relay for continuity and proper function.
5
Scan for any trouble codes using an OBD-II scanner related to the AC system.
6
Inspect the cabin air filter for blockage or contamination.

Solution

💡 Expert Tip

For complex repairs like this, consider taking photos at each step. This helps if you need to reverse a step or consult with a mechanic. Also, keep all removed parts organized - you may need to reference them during reassembly.

Verification

After completing the repair, verify that the issue has been resolved:

✓Test the affected component to ensure it functions correctly
✓Check for any error codes or warning lights
✓Monitor the vehicle for a few days to ensure the issue does not recur

Prevention Tips

To prevent this issue from occurring again:

•Follow the manufacturer's recommended maintenance schedule
•Address warning signs early before they develop into major issues
•Use quality parts and fluids recommended for your vehicle
•Keep detailed records of all repairs and maintenance

Tools & Equipment Required

•OBD-II scanner
•Manifold gauge set
•Socket set
•Wrench set
•AC recovery machine
•Safety goggles
•Gloves

Parts Required

•Refrigerant (R-134a)
•New AC compressor (if needed)
•Cabin air filter

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Diagnostic Steps

1
Inspect the AC system for visible leaks or damage to components.
2
Check the refrigerant level using a manifold gauge set.
3
Test the AC compressor operation by observing if it engages when the AC is turned on.
4
Examine the AC fuse and relay for continuity and proper function.
5
Scan for any trouble codes using an OBD-II scanner related to the AC system.
6
Inspect the cabin air filter for blockage or contamination.

Solution

1. Preparation

Gather necessary tools and parts.
Ensure the vehicle is parked on a level surface and the engine is cool.
Disconnect the battery to ensure safety while working on electrical components.

2. Recharge Refrigerant

Tools Required: Manifold gauge set, refrigerant (R-134a for Ford Explorer), safety goggles, gloves.
Connect the low-pressure side of the manifold gauge to the low-pressure port on the AC system.
Start the engine and turn on the AC to the maximum setting.
Check the pressure readings; if low, proceed to recharge the refrigerant according to manufacturer specifications.
Add refrigerant slowly while monitoring the gauge until the system reaches the recommended pressure.

3. Replace AC Compressor (if faulty)

Tools Required: Socket set, wrench set, AC recovery machine, new AC compressor, o-rings, and refrigerant oil.
Recover refrigerant from the AC system using the recovery machine.
Disconnect the battery again.
Remove the serpentine belt from the AC compressor.
Disconnect electrical connections and refrigerant lines from the compressor.
Remove the mounting bolts and take out the faulty compressor.
Install the new compressor, ensuring to lubricate the o-rings with refrigerant oil before installation.
Reconnect all lines and electrical connectors securely.
Reinstall the serpentine belt.

4. Replace Cabin Air Filter

Tools Required: None (may require a flathead screwdriver depending on the model).
Locate the cabin air filter compartment (usually behind the glove box).
Remove the glove box if necessary to access the filter.
Remove the old filter and install the new one, ensuring correct orientation.
Reassemble any components removed during access.

5. Final Refrigerant Charge

After repairs, connect the manifold gauge set again.
Start the engine and turn on the AC.
Add refrigerant until the system reaches the proper pressure.